An antioxidant agent used to prevent inks from skinning over in the can.

Lines that appear on laid paper as a result of the wires of the papermaking machine.

Black step-marks printed on the back of folded sheets, to facilitate collating and checking of the sequence of book signatures.

A board upon which the copy is pasted for the purpose of photographing.

Paper which has a different color or finish on each side.

Making a printing plate from a film or flat including preparation of the plate surface, sensitizing, exposing through the flat, developing or processing, and finishing.

Any paper that is considered better than #1 by its manufacturer.

A term used to describe how well a paper runs on a printing press.

An excessively large halo around a dot in a photograph that causes a fringe that diminishes the dot intensity.

The Graphic Arts Technical Foundation, GATF has established various quality control images; the star target appears along with the color bar and helps the pressman detect any irregularity in the ink s [..]